Regnum Opus, from In The Box was released in 2022. The perfumer behind this creation is unknown. It has the top notes of Almond, Bergamot, Tangerine, and Water, middle notes of Cardamom, Civet, Gardenia, Geranium, Rose, and Water Lily, and base notes of Agarwood (Oud), Amber, Coffee, Guaiac Wood, Oakmoss, Patchouli, Pink Pepper, Sandalwood, and Vanilla.
